* {
	margin: 0;
	padding: 0;
}

body {
	font-family: "微软雅黑",sans-serif;
	font-weight: 300;
}

ul{
	list-style: none;
}

img {
	border: 0;
}
a{
	text-decoration: none;
	color: black;
}
#header{
	width: 100%;
	height: 40px;
	background-color:orange ;
}
.list{
	width: 1000px;
	height: 60px;
	margin: 0 auto;
}
nav ul{
	display: inline-table;
	position: relative;
}
nav ul::after{
	content: "";
	display: block;
	clear: both;
}
nav ul li{
	float: left;
	/*padding: 0 15px;*/
}
nav ul li:hover{
	background-color:rgba(144,144,144,0.1) ;
}

nav ul li:hover>ul{
	display: block;
	clear: both;
}

nav ul li:hover a{
	color: white;
}

nav ul li a{
	display: block;
	margin: 0 auto;
	color: #FFFFFF;
	line-height: 40px;
	font-size: 16px;
	font-weight: 600;
	text-decoration: none;
	text-align: center;
}
nav ul ul{
	display: none;
	background-color:orange;
	color: #000000;
	opacity: 0.7;
	position: absolute;
	top: 100%;
	padding: 0;
}
nav ul ul li{
	float: none;
    overflow:hidden ;
}